Description: In the odd case that Qt is running on a secondary thread, the main thread instance will have been dereffed asunder because of the deref in QThreadData::current and the deref in the pthread_destroy. To avoid crashing during QCoreApplicationData s global static cleanup we need to safeguard the main thread here. This fix is a bit crude, but it solves the problem for Linux.
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qthread.cpp
qthread.h
qthread_p.h
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